When I encounter a parent telling her children about Santa Claus, I may find it unfortunate that someone would lie to one's own child merely for entertainment purposes. However, I feel little need to say anything. The potential for harm here seems trivially small. I cannot say the same for the Muslim parent instructing his son in the virtues of martyrdom or the Christian who tells her daughter that her Jewish friends will go to hell because they have not been "saved."
These beliefs (i.e., those that are both false and have a reasonably high potential to cause harm) must not be tolerated. No, they must be challenged, criticized, and eventually modified.
